CN109852894A - A kind of economical aging resistant household appliance precoated substrate and its production method - Google Patents
A kind of economical aging resistant household appliance precoated substrate and its production method Download PDFInfo
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- CN109852894A CN109852894A CN201910251770.6A CN201910251770A CN109852894A CN 109852894 A CN109852894 A CN 109852894A CN 201910251770 A CN201910251770 A CN 201910251770A CN 109852894 A CN109852894 A CN 109852894A
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Abstract
The present invention relates to a kind of economical aging resistant household appliance precoated substrates, its chemical component is as follows: calculating by percentage to the quality, C:0.001~0.0160, Si :≤0.025, Mn:0.10~0.16, P :≤0.015, S :≤0.012, Als:0.020~0.050, N :≤0.004, remaining is Fe and inevitable impurity.Production process is as follows: desulfurizing iron, converter smelting, RH application of vacuum, continuous casting, slab inspection and cleaning heating of plate blank, hot continuous rolling, section cooling, are batched, pickling, cold rolling, hot galvanizing, finishing, finishing, oiling, packaging.Both intensity needed for being able to satisfy appliance plate and hardness, it solves timeliness again, there is good pressworkability, be conducive to user and make deep-draw and deform more complex family's electric parts, when reducing punch process the defects of cracking, skid wire or curved surface barring, colored steel lumber recovery is improved.
Description
Technical field
The invention belongs to precoated substrate technical fields, and in particular to a kind of economical aging resistant household appliance precoated substrate and its life
Production method.
Background technique
Increasingly strong with domestic and international energy-saving and emission-reduction requirement, household electrical appliances Coil Coating Products are applied to household electrical appliances row more and more widely
Industry.To 2010, almost all of household appliances enterprise all used Coil Coating Products in various degree.Household electrical appliances Coil Coating Products are the following coated steel sheet hairs
One important directions of exhibition.Baking-curing process of the household electrical appliances colored steel in color coating production, is exactly an artificial aging process.And
Household electrical appliances colored steel is placed in subsequent circulation again after a period of time (such as 3~6 months), and artificial aging adds natrual ageing, inevitable
Cause user surface in Punching Process stretcher strain markings occur, seriously affects the beauty of product；It can also be led when serious
It causes substrate slightly to crack, workpiece is caused to scrap.
Document resource both domestic and external is retrieved by metallurgical industry information standard research institute, is found altogether and this research item
Mesh pertinent literature 11.Shoudu Iron and Steel Co invented a kind of refrigerator outer heat zinc coating plate and its production method (number of patent application:
CN201210205829), chemical component mass percent (wt%) are as follows: C:0.020~0.10, Si≤0.04, Mn:0.20~
0.50, P≤0.015, S≤0.015, Alt:0.020~0.060, N≤0.0040, surplus are Fe and microelement.Pass through design
Reasonable hot rolling, cold rolling and hot dip galvanizing process system obtain the hot-dip galvanizing sheet steel of high-intensitive low timeliness, and mechanical property is surrender
Intensity 280-295MPa, tensile strength 355-365MPa, A80=33-36%, thickness 0.45-0.5mm.But the invention does not have
In view of the influence of the artificial aging in color coating production process.Baosteel invented a kind of baking-aging resistant colored steel plate/strip and
Its manufacturing method (number of patent application: CN200910045844), ingredient percent content (wt%) are C :≤0.003,
Si:0.15~0.25, Mn:0.5~0.8, P:0.06~0.08, S :≤0.01, Ti:0.04~0.07, B:0.0004~
0.0008, N :≤0.003, Al:0.025~0.065, remaining is Fe and is inevitably mingled with.By being coated with after electrogalvanizing
Machine film obtains the colored steel of resistance to timeliness.But the invention is using IF steel (interstitial-freesteel), also known as gap-free atom
Steel, as substrate production household electrical appliances colored steel, high expensive, and the intensity of base steel and hardness can be relatively low.
Intensity needed for household electrical appliances precoated substrate not only will guarantee household electrical appliances steel plate and hardness will also guarantee excellent stampability
Can, wrinkle defect is not generated in punch process deformation process, does not generate stretcher strain markings, and is met household appliances enterprise and dropped this increasing
Imitate principle.Therefore, researchers at home and abroad have been devoted to develop a kind of inexpensive, aging resistant household appliance precoated substrate.
Summary of the invention
The purpose of the present invention is to provide a kind of economical aging resistant household appliance precoated substrate and its production methods.
The technical solution adopted by the present invention to solve the technical problems is: a kind of economical aging resistant household appliance precoated substrate,
Its chemical component is as follows: it calculates by percentage to the quality, C:0.001~0.0160, Si :≤0.025, Mn:0.10~0.16, P :≤
0.015, S :≤0.012, Als:0.020~0.050, N :≤0.004, remaining is Fe and inevitable impurity.
C content of the invention is selected 0.001~0.0160%.Since cementite is relative to carbon steel (matrix is ferrite)
It is cathode, therefore, when carbon content increases, increases cathode quantity and area, correspondingly its corrosion current increases, thus leads
Cause the reduction of its corrosion resistance.It is well known that carbon is most effective solution strengthening element, therefore, with the increase carbon steel of carbon content
It is gradually hardened, while (punching press, drawing) is cold worked for it and welding performance degenerates.In addition, carbon content has significantly hot galvanizing in steel
Influence, phosphorus content is higher, and the reaction of iron-zinc is just stronger, and the loss of iron is bigger, and iron-zinc alloy layer becomes thicker, keeps zinc coat viscous
Attached property degenerates.Amid all these factors, under the premise of guaranteeing some strength, stringent control need to be carried out to C content, carbon content is
0.001~0.016%.
Si content≤0.025% of the invention.Silicon is a kind of stronger solution strengthening element, and a certain amount of silicon, which is added, to be mentioned
The intensity of Gao Gang, but higher silicon content has an adverse effect to meeting hot galvanizing in base steel.As the silicone content in base steel increases,
Then silicon is oxidized the SiO of generation2Content increases therewith, this will affect the effect of subsequent pickling process, if steel after pickling
Plate surface still has the SiO of remaining2, then iron-zinc alloy layer ζ phase acutely thickens in zinc-plated rear coating, grey coating is formed, and make to plate
Layer adhesiveness degenerates.Therefore, it is necessary to by silicone content control in suitable range.Therefore, Si content is≤0.025%.
Mn content 0.10~0.16% of the invention.Mn energy reinforced ferrite, but also be dissolved and increase precoated shet substrate
Intensity.In addition, manganese is added in steel can prevent in hot-working because sulphur causes the embrittlement of steel, but as the content of Coil Coating Products Mn is got over
Height, processing performance will be gradually reduced.Therefore, Mn content is 0.10~0.16%.
P content≤0.015% of the invention.Generally, for the precoated shet substrate for requiring good corrosion resistance
Speech, the content of phosphorus is preferably as low as possible, because phosphorus is easy to happen segregation, causes the embrittlement of steel, deteriorated weldability etc., therefore, P contains
Amount≤0.015%.
S content≤0.012% of the invention.In general, S is objectionable impurities elements in steel, and the affinity of Ti and S are very
By force, therefore, the effect that give full play to Ti first has to stablize and reduce the S content in steel.Therefore, S content≤0.012%.
Als content of the invention is 0.020~0.050%.The addition of Al then will form dissolved aluminum (Als) and acid not in steel
Molten aluminium, and Als includes solid solution aluminium and AlN, the AlN particle of disperse can prevent growing up for austenite grain, refine crystal grain.But for
For carbon aluminium-killed steel, with the increase of Als, the amount of inclusions of steel increases, and inclusion size will also become larger, and will lead to coloured silk
Coating adhesion, corrosion resisting property and the pressworkability of coated plate are deteriorated.But in order to guarantee that N is sufficiently combined generation with Al in steel
AlN, reduces the timeliness of color coating board finished product and the surface quality of the complete deoxidation of molten steel and continuous casting billet, and Als should ensure that >=
0.01%.Therefore, the selection of Als content is 0.02~0.05%.
N content≤0.004% of the invention.N is as C and solid solution element.With the increase of N content in steel, will lead
Its pressworkability is caused to degenerate (such as work hardening index n, the decline of plastic anisotropy's ratio r value), meanwhile, solid solution N is to cause
The main reason for colored steel timeliness, acts on especially for the strain-aging after smooth, and the influence of nitrogen is especially big, therefore it is required that N is most
It measures low.Therefore, the N content in aging resistant household appliance colored steel steel answers≤0.004%.
The production method of above-mentioned economical aging resistant household appliance precoated substrate, comprises the following steps: desulfurizing iron, converter smelting
Refining, RH application of vacuum, continuous casting, slab inspection and cleaning heating of plate blank, hot continuous rolling, section cooling, are batched, pickling, cold rolling, heat
Zinc-plated, finishing, finishing, oiling, packaging.
Specific step is as follows:
D1, first through desulfurizing iron, converter smelting, RH application of vacuum；
D2, then molten steel is carried out to be continuously cast into steel billet, next process will be entered after steel billet inspection and cleaning；
D3, continuous casting billet through hot continuous rolling at steel band, through section cooling, batch after, with coupled pickling and tandem mill to hot rolled strip into
Row pickling；
D4, the cold rolling for then carrying out 5 passages obtain strip, and cold rolling reduction ratio controls in 75~90% ranges, through hot dip
After zinc, finishing, straightening, hot galvanizing household electrical appliances precoated substrate is produced.
Specifically, its rolling mill practice hot continuous rolling uses " three high " process system, i.e., high heating temperature, high finishing temperature
With high coiling temperature.The roughing outlet temperature of hot continuous rolling is 1060-1100 DEG C, and exit temperature at finishing is 900-930 DEG C, is batched
Temperature is 700-730 DEG C.
Specifically, the continuous annealing temperature of hot galvanizing process is 800-820 DEG C, continuous annealing time 60s, it is ensured that N, C fill
Divide and generate stable compound in conjunction with Ti, metallographic structure is ferrite.
Specifically, 458-462 DEG C of zinc liquid temperature of hot galvanizing process, strip enters 460-475 DEG C of zinc pot temperature.
Specifically, finishing+straightening control is 0.9~1.2%, it is ensured that eliminate yield point elongation, slow down or eliminate color coating process
Baking-aging effect.
The invention has the following advantages:
(1) aging resistant household appliance of the invention is closed with the alloys such as Ti, Nb, the Mn of addition is not added in precoated substrate chemical component
Gold amount is also less, to strongly reduce the production cost of galvanized sheet of the present invention.
(2) for household electrical appliances precoated substrate of the present invention with a thickness of 0.36mm~0.80mm, hot dip galvanizing coating weight is 80~120g/
m2(two-sided), yield strength RP0.2 be 160~240MPa, 280~360MPa of tensile strength, elongation after fracture A80mm >=
36%, intensity needed for being not only able to satisfy appliance plate and hardness, but also solve timeliness, there is good pressworkability, have
Deep-draw is made conducive to user and deforms more complex family's electric parts.
(3) it when precoated substrate of the present invention can reduce punch process the defects of cracking, skid wire or curved surface barring, mentions
High colored steel lumber recovery.(or even after placing 3~6 months) is used through user, does not have fold to rise at colored steel plate punch process position
There is not skid wire after punching press or stretcher strain in rib.
Specific embodiment
The following is specific embodiments of the present invention, is described further to technical solution of the present invention, but of the invention
Protection scope is not limited to these examples.It is all to be included in the present invention without departing substantially from the change of present inventive concept or equivalent substitute
Protection scope within.
Embodiment 1
A kind of economical aging resistant household appliance precoated substrate and its production method, household electrical appliances are with precoated substrate thickness specification
0.8mm, chemical component (wt%) are C:0.001, Si:0.020, Mn:0.10, P:0.015, S:0.012, Als:0.020, N:
0.004, remaining is Fe and inevitable impurity.
A kind of economical aging resistant household appliance precoated substrate and its production method are as follows: the following steps are included:
D1, first through desulfurizing iron, converter smelting, RH application of vacuum；
D2, then molten steel is carried out to be continuously cast into steel billet, next process will be entered after steel billet inspection and cleaning；
D3, continuous casting billet through hot continuous rolling at steel band, through section cooling, batch after, with coupled pickling and tandem mill to hot rolled strip into
Row pickling；
D4, the cold rolling for then carrying out 5 passages obtain strip, and cold rolling reduction ratio 75% is raw after hot galvanizing, finishing, straightening
Output hot galvanizing household electrical appliances precoated substrate.
Specifically, the roughing outlet temperature of hot continuous rolling is 1060 DEG C in the step D3, and exit temperature at finishing is 930 DEG C.
Specifically, coiling temperature is 730 DEG C in the step D3.
Specifically, in the hot galvanizing process, continuous annealing temperature is 820 DEG C, continuous annealing time 60s, metallographic structure
For ferrite.
Specifically, in the step D4 hot galvanizing process, 458 DEG C of zinc liquid temperature, strip enters 460 DEG C of zinc pot temperature.
Specifically, finishing+straightening control is 0.9~1.2%.
This chemical component and the household electrical appliances precoated substrate of manufacturing process production, yield strength RP0.2 are 160MPa；Tension is strong
Degree Rm is 280MPa；Elongation after fracture A80mm is 43%；It uses after 1 month through user, does not have at colored steel plate punch process position
There is not skid wire after punching press or stretcher strain in fold barring.
Embodiment 2
A kind of economical aging resistant household appliance precoated substrate and its production method, household electrical appliances are with precoated substrate thickness specification
0.7mm, chemical component (wt%) are C:0.010, Si:0.018, Mn:0.11, P:0.012, S:0.010, Als:0.030, N:
0.003, remaining is Fe and inevitable impurity.
A kind of economical aging resistant household appliance precoated substrate and its production method are as follows: the following steps are included:
D1, first through desulfurizing iron, converter smelting, RH application of vacuum；
D2, then molten steel is carried out to be continuously cast into steel billet, next process will be entered after steel billet inspection and cleaning；
D3, continuous casting billet through hot continuous rolling at steel band, through section cooling, batch after, with coupled pickling and tandem mill to hot rolled strip into
Row pickling；
D4, the cold rolling for then carrying out 5 passages obtain strip, and cold rolling reduction ratio 80% is raw after hot galvanizing, finishing, straightening
Output hot galvanizing household electrical appliances precoated substrate.
Specifically, the roughing outlet temperature of hot continuous rolling is 1071 DEG C in the step D3, and exit temperature at finishing is 924 DEG C.
Specifically, coiling temperature is 726 DEG C in the step D3.
Specifically, in the hot galvanizing process, continuous annealing temperature is 814 DEG C, continuous annealing time 60s, metallographic structure
For ferrite.
Specifically, in the step D4 hot galvanizing process, 459 DEG C of zinc liquid temperature, strip enters 465 DEG C of zinc pot temperature.
Specifically, finishing+straightening control is 0.9~1.2%.
This chemical component and the household electrical appliances precoated substrate of manufacturing process production, yield strength RP0.2 are 174MPa；Tension is strong
Degree Rm is 297MPa；Elongation after fracture A80mm is 41%；It uses after 1 month through user, does not have at colored steel plate punch process position
There is not skid wire after punching press or stretcher strain in fold barring.
Embodiment 3
A kind of economical aging resistant household appliance precoated substrate and its production method, household electrical appliances are with precoated substrate thickness specification
0.5mm, chemical component (wt%) be C:0.0120, Si:0.025, Mn:0.12, P:0.010, S:0.009, Als:0.040,
N:0.004, remaining is Fe and inevitable impurity.
A kind of economical aging resistant household appliance precoated substrate and its production method are as follows: the following steps are included:
D1, first through desulfurizing iron, converter smelting, RH application of vacuum；
D2, then molten steel is carried out to be continuously cast into steel billet, next process will be entered after steel billet inspection and cleaning；
D3, continuous casting billet through hot continuous rolling at steel band, through section cooling, batch after, with coupled pickling and tandem mill to hot rolled strip into
Row pickling；
D4, the cold rolling for then carrying out 5 passages obtain strip, and cold rolling reduction ratio 82% is raw after hot galvanizing, finishing, straightening
Output hot galvanizing household electrical appliances precoated substrate.
Specifically, the roughing outlet temperature of hot continuous rolling is 1082 DEG C in the step D3, and exit temperature at finishing is 922 DEG C.
Specifically, coiling temperature is 722 DEG C in the step D3.
Specifically, in the hot galvanizing process, continuous annealing temperature is 811 DEG C, continuous annealing time 60s, metallographic structure
For ferrite.
Specifically, in the step D4 hot galvanizing process, 460 DEG C of zinc liquid temperature, strip enters 468 DEG C of zinc pot temperature.
Specifically, finishing+straightening control is 0.9~1.2%.
This chemical component and the household electrical appliances precoated substrate of manufacturing process production, yield strength RP0.2 are 192MPa；Tension is strong
Degree Rm is 311MPa；Elongation after fracture A80mm is 39.5%；It uses after 1 month through user, does not have at colored steel plate punch process position
There is fold barring, skid wire does not occur after punching press or stretcher strain.
Embodiment 4
A kind of economical aging resistant household appliance precoated substrate and its production method, household electrical appliances are with precoated substrate thickness specification
0.45mm, chemical component (wt%) be C:0.0140, Si:0.019, Mn:0.14, P:0.011, S:0.010, Als:0.045,
N:0.003, remaining is Fe and inevitable impurity.
A kind of economical aging resistant household appliance precoated substrate and its production method are as follows: the following steps are included:
D1, first through desulfurizing iron, converter smelting, RH application of vacuum；
D2, then molten steel is carried out to be continuously cast into steel billet, next process will be entered after steel billet inspection and cleaning；
D3, continuous casting billet through hot continuous rolling at steel band, through section cooling, batch after, with coupled pickling and tandem mill to hot rolled strip into
Row pickling；
D4, the cold rolling for then carrying out 5 passages obtain strip, and cold rolling reduction ratio 85% is raw after hot galvanizing, finishing, straightening
Output hot galvanizing household electrical appliances precoated substrate.
Specifically, the roughing outlet temperature of hot continuous rolling is 1094 DEG C in the step D3, and exit temperature at finishing is 911 DEG C.
Specifically, coiling temperature is 715 DEG C in the step D3.
Specifically, in the hot galvanizing process, continuous annealing temperature is 806 DEG C, continuous annealing time 60s, metallographic structure
For ferrite.
Specifically, in the step D4 hot galvanizing process, 461 DEG C of zinc liquid temperature, strip enters 472 DEG C of zinc pot temperature.
Specifically, finishing+straightening control is 0.9~1.2%.
This chemical component and the household electrical appliances precoated substrate of manufacturing process production, yield strength RP0.2 are 229MPa；Tension is strong
Degree Rm is 331MPa；Elongation after fracture A80mm is 37.5%；It uses after 1 month through user, does not have at colored steel plate punch process position
There is fold barring, skid wire does not occur after punching press or stretcher strain.
Embodiment 5
A kind of economical aging resistant household appliance precoated substrate and its production method, household electrical appliances are with precoated substrate thickness specification
0.36mm, chemical component (wt%) be C:0.0160, Si:0.022, Mn:0.16, P:0.012, S:0.008, Als:0.050,
N:0.003, remaining is Fe and inevitable impurity.
A kind of economical aging resistant household appliance precoated substrate and its production method are as follows: the following steps are included:
D1, first through desulfurizing iron, converter smelting, RH application of vacuum；
D2, then molten steel is carried out to be continuously cast into steel billet, next process will be entered after steel billet inspection and cleaning；
D3, continuous casting billet through hot continuous rolling at steel band, through section cooling, batch after, with coupled pickling and tandem mill to hot rolled strip into
Row pickling；
D4, the cold rolling for then carrying out 5 passages obtain strip, and cold rolling reduction ratio 90% is raw after hot galvanizing, finishing, straightening
Output hot galvanizing household electrical appliances precoated substrate.
Specifically, the roughing outlet temperature of hot continuous rolling is 1100 DEG C in the step D3, and exit temperature at finishing is 900 DEG C.
Specifically, coiling temperature is 700 DEG C in the step D3.
Specifically, in the hot galvanizing process, continuous annealing temperature is 800 DEG C, continuous annealing time 60s, metallographic structure
For ferrite.
Specifically, in the step D4 hot galvanizing process, 462 DEG C of zinc liquid temperature, strip enters 475 DEG C of zinc pot temperature.
Specifically, finishing+straightening control is 0.9~1.2%.
This chemical component and the household electrical appliances precoated substrate of manufacturing process production, yield strength RP0.2 are 240MPa；Tension is strong
Degree Rm is 360MPa；Elongation after fracture A80mm is 36%；It uses after 1 month through user, does not have at colored steel plate punch process position
There is not skid wire after punching press or stretcher strain in fold barring.
Claims (8)
1. a kind of economical aging resistant household appliance precoated substrate, which is characterized in that its chemical component is as follows: by percentage to the quality
Calculate, C:0.001~0.0160, Si :≤0.025, Mn:0.10~0.16, P :≤0.015, S :≤0.012, Als:0.020~
0.050, N :≤0.004, remaining is Fe and inevitable impurity.
2. the production method of economical aging resistant household appliance precoated substrate as described in claim 1, which is characterized in that including as follows
Process: desulfurizing iron, converter smelting, RH application of vacuum, continuous casting, slab inspection and cleaning, heating of plate blank, hot continuous rolling, laminar flow are cold
But, batch, pickling, cold rolling, hot galvanizing, finishing, finishing, oiling, packaging.
3. the production method of economical aging resistant household appliance precoated substrate as claimed in claim 2, which is characterized in that described specific
Steps are as follows:
D1, first through desulfurizing iron, converter smelting, RH application of vacuum；
D2, then molten steel is carried out to be continuously cast into steel billet, next process will be entered after steel billet inspection and cleaning；
D3, continuous casting billet through hot continuous rolling at steel band, through section cooling, batch after, acid is carried out to hot rolled strip with coupled pickling and tandem mill
It washes；
D4, the cold rolling for then carrying out 5 passages obtain strip, and cold rolling reduction ratio controls in 75~90% ranges, through hot galvanizing, light
After whole, straightening, hot galvanizing household electrical appliances precoated substrate is produced.
4. the production method of economical aging resistant household appliance precoated substrate as claimed in claim 2 or claim 3, which is characterized in that described
The roughing outlet temperature of hot continuous rolling is 1060-1100 DEG C, and exit temperature at finishing is 900-930 DEG C.
5. the production method of economical aging resistant household appliance precoated substrate as claimed in claim 2 or claim 3, which is characterized in that described
Coiling temperature is 700-730 DEG C.
6. the production method of economical aging resistant household appliance precoated substrate as claimed in claim 2 or claim 3, which is characterized in that described
The continuous annealing temperature of hot galvanizing process is 800-820 DEG C, and continuous annealing time 60s, metallographic structure is ferrite.
7. the production method of economical aging resistant household appliance precoated substrate as claimed in claim 2 or claim 3, which is characterized in that described
458-462 DEG C of zinc liquid temperature of hot galvanizing process, strip enters 460-475 DEG C of zinc pot temperature.
8. the production method of economical aging resistant household appliance precoated substrate as claimed in claim 2 or claim 3, which is characterized in that described
Finishing+straightening control is 0.9~1.2%.
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| CN110205556A (en) * | 2019-07-08 | 2019-09-06 | 武汉钢铁有限公司 | Yield strength >=280MPa elevator colored steel and production method |
| CN111850378A (en) * | 2020-07-17 | 2020-10-30 | 张家港扬子江冷轧板有限公司 | Method for eliminating white marks of galvanized household electrical appliance board |
| CN112251673A (en) * | 2020-10-14 | 2021-01-22 | 武汉钢铁有限公司 | Vehicle color steel plate with special coating structure and preparation method thereof |
| CN112359285A (en) * | 2020-11-09 | 2021-02-12 | 山东钢铁集团日照有限公司 | Ageing-resistant cold-rolled continuously annealed steel strip and manufacturing method thereof |
| CN114934248A (en) * | 2022-03-30 | 2022-08-23 | 日照宝华新材料有限公司 | Production method of hot-base galvanized plate for refrigerator slide rail |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110205556A (en) * | 2019-07-08 | 2019-09-06 | 武汉钢铁有限公司 | Yield strength >=280MPa elevator colored steel and production method |
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| CN111850378A (en) * | 2020-07-17 | 2020-10-30 | 张家港扬子江冷轧板有限公司 | Method for eliminating white marks of galvanized household electrical appliance board |
| CN112251673A (en) * | 2020-10-14 | 2021-01-22 | 武汉钢铁有限公司 | Vehicle color steel plate with special coating structure and preparation method thereof |
| CN112359285A (en) * | 2020-11-09 | 2021-02-12 | 山东钢铁集团日照有限公司 | Ageing-resistant cold-rolled continuously annealed steel strip and manufacturing method thereof |
| CN114934248A (en) * | 2022-03-30 | 2022-08-23 | 日照宝华新材料有限公司 | Production method of hot-base galvanized plate for refrigerator slide rail |
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